Hacksaw-frame.



-- J. W. MOQUILLAN.

v EAOKSAW FRAME.

APPLICATION FILED MAY 5, 1910.

Patented Apr. 16, 1912.

Q.) )Q v Q INVENTOR.

' WITNESSES:

A TTORNEY.

I UNTTED STATES FATENT QFFTQE.

JOSEPH W. MCQUILLAN, 0F SPRINGFIELD, MASSACHUSETTS, ASSIGNOR T0 MASSA- CHUSETTS SAW WORKS, OF CHICOPEE, MASSACHUSETTS, AN ASSOCIATION.

HACKSAW-FRAME.

Specification of Letters Patent.

Patented Apr. 16, 1912.

To all whom it may concern:

Be it known that I, Josnrrr W. MoQUIL- LAN, a citizen of the United States of America, residing at Springfield, in the;

This invention relates to improvements in hack-saw frames in which the blade is supported by means of two angular arm members, their inner ends belng recelved 111 a housin and a suitable structure for locko u 0 mg the arms in the housing, and at the same time permitting their separation from each other in order that blades of difierent lengths may be inserted in the frame.

The object of the invention is to produce a structure that will permit the ready insertion and removal of a blade in the frame, and also blades of different lengths.

In the drawings forming part of this application,Figure l is a side elevation of the complete frame with the housing member shown partially in section so as to illus trate the construction of the locking device for the arm members. Fig. 2 shows a position of one of the arm members when in an unlocked position and in the act of separating or drawing out the member from the housing. Fig. 3 is a transverse sectional view on the line 33, of Fig. 1 showing the locking pin carried by the arm member and located in one of the receiving recesses in the housing.

Referring to the drawings in detail, a and b designate the arm members (in the lower or outer ends of which the saw is attached) which are provided with the usual'curved portion 0, the inner ends of the arm members being designated by the letter (Z, and are, as shown in Fig. 1, in juxtaposition with relation to each other. Rotatably mounted in the lower ends of the arm members are blade-receiving elements 6 and 7'' which are provided with lugs or projections 9 that are adapted to be received in correspondingly shaped sockets of the bearing it so that the blade, shown at 2', is prevented from rotating; yet at the same time may be adjusted in different planes to suit the work that is being performed. The manner in which the blade is supported in the arm members a and I), just referred to, forms however no part of my invention.

j designates a U-shaped housing shown in sectional view in Fig. 3, into which the inner ends (Z of the arms a and Z) extend. Each of the arms is provided with a locking-pin k that is adapted to enter any one of the recesses m which lead into or communicate with the longitudinally arranged slot 0 in one side of the housing 3' which is loosely mounted on the ends of the arm members 0. Near the ends of the housing and extending transversely thereof is a pin p, and midway,-of its length and extending transversely thereof is a pin q over which extends a leaf-spring 1' which is provided with an upwardly curved part 8 so that it will be retained on the pin (7 against displacement. This spring, as shown in Fig. 1, is placed under stress and of such shape as to exert an upward movement tothe inner ends d of. the arms a and Z), thus forcing the pins 76 into the recesses m, whereby the two arm members will be locked in the housing When the handle is operated to tighten the blade 2', the effect will be to move the inner ends (Z of the arms 6 upward or bring them into alinement. When it is desired to remove the blade 2' to insert one of a different length, the handle 25 is rotated .so as to loosen the blade, and after its removal the arms a and Z) may be bent downward, as shown in Fig. 2, permitting the pin Z2 to enter the slot 0 so that the arms may be moved backward and forward in the housing until the right distance between the members 6 and f is attained. Then, when the operator releases his hold on the arms a and b, the spring 1- will snap the pin 70 into one of the recesses m, as already described. During this operation, the inner ends cl of the arm members a and I) rest upon or are supported by, the pins 79, as shown in Fig. 2, and the spring 0" is bent downward, as shown.

What I claim, is

1. A hack saw frame comprising a pair of arm members for attaching the blade, a pin near the inner end of each arm, a Usl1aped housing saddled upon the arm members and having two longitudinal slots in one side with recesses opening into the same to receive the pins on the arm members, the inner side of the housing being opposite the blade, a transverse pin connecting the sides of the housing at each end thereof adjacent its open side and on which the arm members may slide or be tilted, another transverse pin intermediate the ends of the housing and connecting the sides thereof, a single flat spring provided with a depression intermediate its ends which straddles said intermediate transverse pin, the ends of the spring normally diverging and adapted to engage the underside of the arm members to force the pins of the arm members outward into the recesses of the housing, said construction permitting the arm members to slide in the housing and to permit both arms to be tilted on the transverse pins at the ends of the housing against the action of the ends of said spring to throw the inner ends of both of the arm members downward through the open side of the housing toward the blade when adjusting, as described.

2. hack saw frame comprising a pair of arm members for attaching the blade, a pin near the inner end of each arm, ahousing saddled upon the arm members and having two longitudinal slots in one side with recesses opening into the same to receive the pins on the arm members, the housing having an open side opposite the blade, a transslide or be tilted, a single flat spring secured intermediate its ends within the housing with its securing means disposed adjacent the inner ends of the arm members and with its ends projecting toward the outer ends of the housing and bearing normally against the underside of the arm members to force the pins of the arm members outward into the recesses of the housing, said construction permitting the arm members to slide in the housing and to permit both arms to be tilted on the transverse pins at the ends of the housing against the action of the ends of said spring to throw the inner ends of both or the arm members downward through the open side of the housing toward the blade, when adjusting as described.

JOSEPH W. MOQUILLAN. Witnesses:

K. I. OLEMoNs, HARRY W. BOWEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. C. 

